Lecture 14
Magnetic Circuits
An electromagnetic-mechanical system is formed with the following blocks.
We know that the integral form of Ampere’s Law is
C
S
H dl
J dS
=
∫
∫
i
i
L
.
Considering the
next figure, an iron core with cross-sectional area A and with mean length of perimeter l,
several assumptions were made:
Ampere’s
Law
Material
properties
Faraday’s
Law
Ohm’s
Law, KCL,
and KVL
Lorenz’s
Law and
energy
conservation
Newton’s
and
Lagrange’s
Laws
Speed,
displacement
e
B,
Φ
H
i

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